CI: failing OpenSUSE mkosi jobs

[mrc0mmand]

Looking at the recent CI results (https://github.com/systemd/systemd/actions/workflows/mkosi.yml) there appears to be something wrong with the OpenSUSE mkosi CI job, since it keeps failing pretty much constantly:

 subprocess.CalledProcessError: Command '['zypper', '--root', '/var/tmp/mkosi-6ptifpz8/root', '--gpg-auto-import-keys', 'install', '-y', '--no-recommends', '--download-in-advance', 'binutils', 'btrfsprogs', 'dbus-1', 'dracut', 'gdb', 'kernel-default', 'libapparmor1', 'libcrypt1', 'libcryptsetup12', 'libgcrypt20', 'libkmod2', 'liblz4-1', 'libmount1', 'libp11-kit0', 'libqrencode4', 'libseccomp2', 'nano', 'pam', 'patterns-base-minimal_base', 'strace', 'systemd', 'util-linux']' returned non-zero exit status 107.

Given the zypper exit code and its documentation (107 - ZYPPER_EXIT_INF_RPM_SCRIPT_FAILED), it's caused by the failing %post scriptlets:

(151/151) Installing: kernel-default-5.14.9-1.2.x86_64 [.............done]
Additional rpm output:
gzip: /proc/config.gz: No such file or directory
warning: Found bdb_ro Packages database while attempting ndb backend: using bdb_ro backend.
Please run "/usr/bin/dracut -f /boot/initrd-5.14.9-1-default 5.14.9-1-default" as soon as your system is complete.
You may need to setup and install the boot loader using the
available bootloader for your platform (e.g. grub, lilo, zipl, ...).
warning: %post(kernel-default-5.14.9-1.2.x86_64) scriptlet failed, exit status 1


Executing %posttrans script 'openSUSE-release-20211012-1210.1.x86_64.rpm' [...
Output of coreutils-8.32-8.5.x86_64.rpm %posttrans script:
    Please run "/usr/bin/dracut -f --regenerate-all" as soon as your system is complete.

.
Output of systemd-presets-common-SUSE-15-19.2.noarch.rpm %posttrans script:
    Created symlink /etc/systemd/system/multi-user.target.wants/kbdsettings.service -> /usr/lib/systemd/system/kbdsettings.service.
    Created symlink /etc/systemd/system/getty.target.wants/getty@tty1.service -> /usr/lib/systemd/system/getty@.service.
    Created symlink /etc/systemd/system/multi-user.target.wants/remote-fs.target -> /usr/lib/systemd/system/remote-fs.target.
    Created symlink /etc/systemd/user/timers.target.wants/systemd-tmpfiles-clean.timer -> /usr/lib/systemd/user/systemd-tmpfiles-clean.timer.
    Created symlink /etc/systemd/user/basic.target.wants/systemd-tmpfiles-setup.service -> /usr/lib/systemd/user/systemd-tmpfiles-setup.service.

.
Output of rpm-4.16.1.3-3.2.x86_64.rpm %posttrans script:
    migrating rpmdb from /var/lib/rpm to /usr/lib/sysimage/rpm...

......done]

@Werkov could you, please, look into this?